The message contains Unicode characters and has been sent as a binary attachment.

这条信息含有统一码字符，已经以二进制附件形式发送。

《柯林斯英汉双解大词典》

Use Unicode characters for the values.

数值要使用Unicode字符。

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How to manually enter Unicode characters?

如何手动输入unicode字符？

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Since machines understand text as a series of numbers, which users see on screen as letters or characters, they developed a standard called Unicode that assigns a unique code to every glyph, character or letter in the world's written languages.

CNN: COMMUNICATION